You might have a cheat for this. I had similar issues, unincorporated area with no residential delivery. The local post office allows use of their street address, allowing UPS and FEDEX to deliver. You need to use post office address as primary and then list your box number as secondary. Same process as sending package to apartment complex or office building, street address, suite# or apartment#
Name
Post Office street address
Your Box Number
City, State, Zip Code
Name
Post Office street address
Your Box Number
City, State, Zip Code

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